[BUG] "Read" and "Update" tool slow and will stuck main process of claude code.

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

"Read" and "Update" tool slow and will stuck main process of claude code.
You could see animation stop update here

<img width="396" height="63" alt="Image" src="https://github.com/user-attachments/assets/8f9e0f10-8dea-4709-9532-163cf7ff8718" />

and claude code lost response to keyboard input, like ctrl+t, ctrl+o, esc, .etc

What Should Happen?

Main process of claude code should not be blocked by "Read" and "Update" tool.
Animation should still update.
Claude code should response to keyboard input, like ctrl+t, ctrl+o, esc, .etc

Error Messages/Logs

Steps to Reproduce

1. ask claude code to read a big file to give a code review.
2. sometimes claude code will stuck when "Read".
3. ask claude code to write something to a file
4. sometimes claude code will stuck when "Update"

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

1.0.98

Claude Code Version

1.0.113

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_